IGCSE PRE-AICE CHEMISTRY 0620 OFFICIAL STUDY GUIDE Notes: To avoid any confusion concerning the symbol for litre‚ dm3 will be used in place of l or litre.Valence electrons are known as valency electrons for this test. Nature of Matter The states of matter are solid‚ liquid‚ and gas‚ in respective order of kinetic energy. State of Matter | Definite Volume | Definite Shape | Solid | Yes | Yes | Liquid | Yes | No | Gas | No | No | Diffusion:
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the __________ of the reaction. A) the quantities of reactants and products initially present B) stoichiometry and mechanism C) mechanism D) stoichiometry E) temperature 6) At elevated temperatures‚ molecular hydrogen and molecular bromine react to partially form hydrogen bromide: H2 (g) + Br2 (g) ⇌ 2HBr (g) A mixture of 0.682 mol of H2 and 0.440 mol of Br2 is combined in a reaction vessel with a volume of 2.00 L. At equilibrium at 700 K‚ there are 0.566 mol of H2
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Midterm Review Assessment Part 1 of 8 - 4.0/ 4.0 Points Question 1 of 22 2.0/ 2.0 Points Which of the following is true about a good hypothesis? A.It is testable B.It is repeatable C.It is falsifiable D.All of these are good traits for a hypothesis. Answer Key: D Feedback: Good. A good hypothesis is always able to proven wrong with subsequent experimentation. Question 2 of 22 2.0/ 2.0 Points The atomic theory is attributed to which of the following scientists? A.John Dalton
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THIS IS A LEGACY SPECIFICATION H Thursday 26 January 2012 – Morning GCSE GATEWAY SCIENCE ADDITIONAL SCIENCE B B623/02 Unit 1 Modules B3 C3 P3 (Higher Tier) * B 6 2 0 7 6 0 1 1 2 * Candidates answer on the Question Paper. A calculator may be used for this paper. Duration: 1 hour OCR supplied materials: None Other materials required: • Pencil • Ruler (cm/mm) * B 6 2 3 0 2 * INSTRUCTIONS TO CANDIDATES • • • • • • Write your name‚ centre number
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S2 molecule which has 2 unpaired electrons in the antibondind pi orbitals jus lyk oxygen and thus exhibits paramagnetism. 2 An interhalogen compound is a molecule whose atom contains two or more different halogen atoms (fluorine‚ chlorine‚ bromine‚ iodine or astatine). Most interhalogen compounds known are binary (composed of only two distinct elements). Their formulas are generally XYn‚ where n = 1‚ 3‚ 5 or 7‚ and X is the less electronegative of the two halogens. They are all prone to
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PRINCIPLE INSTRUMENTATION SAMPLE AUTOMIZATION TECHNIQUES INTERFERENCES AND APPLICATIONS. ELEMENTAL ANALYSIS SUCH AS DETERMINATION OF SODIUM‚ POTASSIUM‚ CALCIUM‚ PHOSPHOROUS‚ SULFUR‚ CHLORINE‚ BROMINE AND IODINE Introduction AAS used as an analytical tool was first developed by an Australian physicist Alan walah Atomic spectrometric methods are rapid ‚convenient and have high selectivity The method involves a process called as atomization in which the sample is converted to a gaseous
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Edexel IGCSE Chemistry Revision Notes IGCSE Chemistry Triple Award Revision Guide Topic Introduction to chemistry Atomic Structure Structure and Bonding – Ionic Bonding Structure and Bonding – Covalent and Metallic Bonding Organic Chemistry - Alkanes Organic Chemistry – Alkenes / Addition Polymerisation Organic Chemistry – Alcohols / Condensation Polymerisation Calculations Periodic Table Reactivity Series and Metal Extraction Electrolysis Energetics Acids‚ Bases‚ Salts and Neutralisation Preparing
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Q3. What is Environment? Why is it essential for management students & practitioners to study environment & its management? Answer:- Environmental Protection Act (1986) defined “Environment as the sum total of water‚ air and land‚ their interrelationship among themselves and with the human beings‚ other living beings and property.” The important things in the environment that we value are called ‘Natural Resources’. There are 2 types. 1. Renewable Natural Resources: - They grow naturally when we
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Periodic Table of the Elements Group 1 Group 18 1 1 1.00794 1 2 H 1s1 Hydrogen Group 2 Atomic Number Key 30 65.39 2 Atomic Mass 4.002602 0 He Group 13 Group 14 Group 15 Group 16 Group 17 1s2 Helium 3 2 (6.941) 1 4 9.012182 2 Li [He]2s1 Lithium Be [He]2s2 Beryllium Zn [Ar]3d104s2 Zinc Oxidation States Symbol Electron Configuration 5 10.811 3 6 12.0107 ±4‚2 7 14.0067 ±3‚5‚4‚2 8 15.9994 -2 9 18.9984032 -1 10
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Chemistry Review (mid-term) 1. Use the equation for atomic mass to answer the following questions. (http://johnheilchem10.escuelacampoalegre.wikispaces.net/file/view/average+atomic+mass+calculations+-+3.pdf) 1. Argon has three naturally occurring isotopes: argon-36‚ argon-38‚ and argon-40. Based on argon’sreported atomic mass‚ which isotope do you think is the most abundant in nature? Explain. 2. Copper is made of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu.
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